Improvement in pet-cocks for steam-engines



M. MEEH AN. PETCOCK FOR STEAM-ENGINE.

Patented Feb. 20

N-FETERS, FHOTO-UTHOGMPHER. WASHINGTON- D C.

rectly to the seat of the Unrrnp STATES PATENT OFFICE.

MATHEW MEEHAN, or ATHENS, PENNSYLVANIA.

IMPROVEMENT IN PET-COCKS FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. l 87,661. datedFebruary 20, 1877; application filed September 29, 1876.

To all whom it may concern Be it known that I, MATHEW MEEHAN, of Athens,in the county of Bradford and State of Pennsylvania, have inventedcertain new and useful Improvements in Pet Cocks for Steam-Engines, ofwhich the following isa specification In steam-engines the pet-cock isliable to freeze in Winter, and to interfere with the working of thepumps.

My object is to provide a simple means to keep the pet cock in conditionto open at all times, and the pumps always in working order, and freefrom the disadvantage of having to thaw out the cock before the pumpscan be used. For this purpose I have improved the petcock by a simpleand novel construction, in which the cock proper is surrounded at itsjunction with the barrel by a steam chamber having communication withthe boiler, so that the heat from the steam will be applied dicock, andwithin a spherical chamber through which said seat and cook both pass.making a cheap casting with the water-way, the cock-seat, and thesteamcirculating chamber as a unitary, and within the immediatejunctionof the cock and its seat and the barrel.

In the accompanying drawings, Figure 1 represents a vertical section ofa boiler petcock embracing my invention; Fig. 2, a similar section atright angles to Fig. l, and Fig. 3 a horizontal section.

The tube or barrel A and the plug or cock B are of the ordinaryconstruction for open-' ing and closing the water-passage connecting thepumps with the boiler; but in constructing these parts I cast aspherical shell, 0, forming a chamber, D, at their junction, whichsurrounds the seat a, for the cock and the water tube orbarrel b, andconstituting in efi'ect a pet-cock with a jacket and circulating-chamberas an entirety,'and within which chamber the steam enters at the inlet0, and, giving out its heat upon the walls of the plug-seat and of thewater tube or barrel, passes out at d, and keeps the cock entirely freefrom freezing, and the pumps always in condition for use. A current ofsteam is passed round the petcock seat, where it joins the barrel, bymeans of a suitable connecting-pipe, provided with a cock to let on andcut off the flow of steam when desired. The opening 01 for the escape ofthe steam is made at the bottom of the chamber, to allow thecondensation to pass out, while the inlet-opening c is arranged todeliver the steam directly against the walls of the plug-seat and waterways.

The device is especially applicable for locomotives.

-I claim 1. A pet-cock provided with a steam jacket or chamber, G D,encompassing the intermediate junction of water-tube I) and cook B,around which junction the steam enters, circulates, and passes out,substantially as described.

2. In a pet-cock provided with a steamjacket, as described, theinlet-port 0, arranged in such position as to cause the steam-jet toimpinge directly upon the junctions of cock and barrel, in combinationwith the outlet d, for the purpose set forth.

In testimony whereof I have affixed my signature in the presence of twowitnesses.

V MATHEW MEEHAN. Witn'esses:

GUY M. Toznn, W. O. THURsToN.

warming

